| A | B |
|---|
| selectively permeable | some substances can pass trhough while others cannot |
| diffusion | process of molecules moving from higher concentrations to lower concentrations |
| oxygen, water, carbon dioxide | substances that usually pass through the cell membrane |
| large molecules and salts | substances that usually don't pass through the cell membrane |
| osmosis | the diffusion of water molecules |
| cells | building blocks of life |
| molecule | the smallest unit of most compounds |
| atom | the smallest unit of an element |
| element | any substance that cannot be broken down into simpler substances |
